Field
of View Reduction with RF Shield Mesh Sheet

Reduction of FOV is a key technique to shorten scan time
or to decrease voxel size. Here, we introduced a RF shielding mesh sheet which
is a net of nylon fiber covered with 99% silver and examined its usefulness
(safety and shielding effectiveness) for FOV reduction on a 1.5T environment.
Although no heating was occurred, only with balanced-SSFP, some volunteers felt
tiny stimulation at their peripheral part because of large and rapid gradient
switching. Signal intensity of arms covered with the mesh decreased to the
noise level. By wrapping with insulated cloth, the mesh can reduce FOV
effectively and safely.